Datasheet

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General Description

The MAX7323 2-wire serial-interfaced peripheral features

eight I/O ports. Four ports are push-pull outputs and the

other four are open-drain I/O ports that are overvoltage

protected up to +6V independent of the supply voltage.

The four I/O ports configured as inputs are continuously

monitored for state changes (transition detection). State

changes are indicated by the open-drain INT output.

The interrupt is latched, allowing detection of transient

changes. When the MAX7323 is subsequently accessed

through the serial interface, any pending interrupt is

cleared.

The four push-pull and four open-drain outputs are rated

to sink 20mA and are capable of driving LEDs.

The RST input clears the serial interface, terminating any

C communication to or from the MAX7323.

The MAX7323 uses two address inputs with four-level

logic to allow 16 I

C slave addresses. The slave address

also determines the power-up logic state for the I/O ports,

and enables or disables internal 40kΩ pullups for the

input ports in groups of two ports.

The MAX7323 is one device in a family of pin-compatible

port expanders with a choice of input ports, open-drain I/O

ports, and push-pull output ports (see Table 1).

The MAX7323 is available in 16-pin QSOP and 16-pin

TQFN packages, and is specified over the automotive

temperature range (-40°C to +125°C).

Applications

Features

● 400kHz I

C Serial Interface

● +1.71V to +5.5V Operating Voltage

● 4 Push-Pull Output Ports Rated at 20mA Sink

Current

● 4 Open-Drain I/O Ports Rated to 20mA Sink Current

● 4 I/O Ports Are Overvoltage Protected to +6V

● Transient Changes Are Latched, Allowing Detection

Between Read Operations

● INT Output Alerts Change on Inputs

● AD0 and AD2 Inputs Select from 16 Slave Addresses

● Low 0.6µA (typ) Standby Current

● -40°C to +125°C Operating Temperature Range

19-3806; Rev 2; 5/14

+Denotes a lead-free package.

*EP = Exposed pad.

Selector Guide

Pin Configurations and Functional Diagram appear at end

of data sheet.

Ordering Information

● Cell Phones

● SAN/NAS

● Servers

● Notebooks

● RAID

Typical Application Circuit

PART INPUTS

INTERRUPT

MASK

OPEN-

DRAIN

OUTPUTS

PUSH-PULL

OUTPUTS

MAX7319 8 Yes — —

MAX7320 — — — 8

MAX7321 Up to 8 — Up to 8 —

MAX7322 4 Yes — 4

MAX7323 Up to 4 — Up to 4 4

MAX7328 Up to 8 — Up to 8 —

MAX7329 Up to 8 — Up to 8 —

PART TEMP RANGE PIN-PACKAGE

TOP

MARK

MAX7323AEE+ -40°C to +125°C 16 QSOP —

MAX7323ATE+ -40°C to +125°C

16 TQFN-EP*

(3mm x 3mm)

ADE

MAX7323

V+

0.047F

µC

SCL

SDA

SCL

AD0

SDA

AD2

INT

OUTPUT

RST

INT

RST

I/O

OUTPUT

3.3V

GND

MAX7323 I

C Port Expander with 4 Push-Pull

Outputs and 4 Open-Drain I/Os

EVALUATION KIT AVAILABLE

Summary of content (15 pages)

PAGE 1
EVALUATION KIT AVAILABLE I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 General Description The MAX7323 2-wire serial-interfaced peripheral features eight I/O ports. Four ports are push-pull outputs and the other four are open-drain I/O ports that are overvoltage protected up to +6V independent of the supply voltage. The four I/O ports configured as inputs are continuously monitored for state changes (transition detection).
PAGE 2
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Absolute Maximum Ratings (All voltages referenced to GND.) Supply Voltage V+....................................................-0.3V to +6V SCL, SDA, AD0, AD2, RST, INT, P2–P5.................-0.3V to +6V O0, O1, O6, O7.............................................. -0.3 to (V+ + 0.3V) O0, O1, O6, O7 Output Current........................................±25mA P2–P5 Sink Current........................................................
PAGE 3
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Port and Interrupt INT Timing Characteristics (V+ = +1.71V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA = +25°C.
PAGE 4
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) V+ = +5.0V 1.0 0.8 V+ = +2.5V V+ = +3.3V 0.6 0.4 0 V+ = +1.71V V+ = +2.5V 0 V+ = +1.71V -40 -25 -10 5 20 35 50 65 80 95 110 125 OUTPUT VOLTAGE HIGH vs. TEMPERATURE MAX7323 toc03 OUTPUT VOLTAGE LOW vs. TEMPERATURE V+ = +5.0V ISINK = 20mA 0.25 V+ = +2.5V V+ = +3.3V ISINK = 10mA ISINK = 15mA 0.10 6 V+ = +1.71V ISINK = 5mA 0.
PAGE 5
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Detailed Description Functional Overview MAX7319–MAX7329 Family Comparison The MAX7319–MAX7323 family consists of five pin-compatible, eight-port expanders. Each version is optimized for different applications. The MAX7328 and MAX7329 are industry-standard parts.
PAGE 6
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Table 1. MAX7319–MAX7329 Family Comparison (continued) PART MAX7323 MAX7328 MAX7329 I2C SLAVE INPUTS ADDRESS 110xxxx 0100xxx 0111xxx Up to 4 INPUT INTERRUPT MASK — OPENDRAIN OUTPUTS Up to 4 PUSHPULL OUTPUTS APPLICATION 4 4 I/O, 4 output-only versions: 4 open-drain I/O ports with latching transition detection interrupt and selectable pullups. 4 push-pull outputs with selectable power-up default levels.
PAGE 7
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Table 2.
PAGE 8
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Table 3.
PAGE 9
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 SDA tSU,STA tSU,DAT tLOW tHD,DAT tBUF tHD,STA tSU,STO tHIGH SCL tHD,STA tR tF START CONDITION REPEATED START CONDITION STOP CONDITION START CONDITION Figure 1. 2-Wire Serial Interface Timing Details Serial Interface Serial Addressing SDA The MAX7323 operates as a slave that sends and receives data through an I2C interface.
PAGE 10
MAX7323 Accessing the MAX7323 The MAX7323 is accessed through an I2C interface. The transition flags are cleared, and INT is deasserted each time the device acknowledges the I2C slave address. A single-byte read from the MAX7323 returns the status of the four I/O ports and the four output ports (read back as inputs). A 2-byte read returns first the status of the four I/O ports and the four output ports (as for a single-byte read), followed by the four transition flags for the four I/O ports.
PAGE 11
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 1 SDA 1 0 A2 A3 A1 A0 R/W ACK LSB MSB SCL Figure 5. Slave Address PORT I/O P6 P7 S 1 1 0 MAX7321 SLAVE ADDRESS 1 A D7 R/W P5 D6 P4 P3 DATA D5 D4 P1 P2 D3 D2 P0 D1 D0 N P PORT SNAPSHOT PORT SNAPSHOT SCL tPH PORT I/O tIV tPSU tIR INT OUTPUT tIP INT REMAINS HIGH UNTIL STOP CONDITION Figure 6.
PAGE 12
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 1 SCL 2 3 4 5 6 7 8 DATA TO PORT SLAVE ADDRESS SDA S 0 START CONDITION A DATA TO PORT DATA 1 A DATA 2 A R/W tPV INTERNAL WRITE TO PORT DATA OUT FROM PORT tPV DATA 1 VALID tPV DATA 2 VALID tPV S = START CONDITION SHADED = SLAVE TRANSMISSION P = STOP CONDITION N = NOT ACKNOWLEDGE Figure 8.
PAGE 13
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Functional Diagram AD0 O0 O1 P2 P3 P4 P5 O6 O7 AD2 SCL SDA RST INPUT I2 C CONTROL FILTER I/O PORTS INT POWERON RESET MAX7323 Driving LED Loads When driving LEDs from one of the four output ports (O0, O1, O6, or O7), a resistor must be connected in series with the LED to limit the LED current to no more than 20mA.
PAGE 14
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Driving Load Currents Higher than 20mA The MAX7323 can be used to drive loads, such as relays, that draw more than 20mA by paralleling outputs. Use at least one output per 20mA of load current; for example, a 5V, 330mW relay draws 66mA, and therefore, requires four paralleled outputs.
PAGE 15
I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7323 Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 1 7/07 — 2 5/14 No /V OPNs; removed automotive reference from Applications section; updated Packaging Information DESCRIPTION 1–17 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.